package/python-pylibftdi: Fix LICENSE hash after 0.18.1 bump

package/python-pylibftdi: Fix LICENSE hash after 0.18.1 bump

Commit dd90d40b5226 (package/python-pylibftdi: bump version to 0.18.1)
bumped the version of the package but failed to take into account the change
of copyright year in the license file:

-Copyright (c) 2010-2018 Ben Bass
+Copyright (c) 2010-2019 Ben Bass

Adjust the license file to match the new content.

Signed-off-by: Christian Kellermann <christian.kellermann@solectrix.de>
[Peter: extend commit message, add SOB]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>